| 内蒙古赤峰维拉斯托大型锡多金属矿的地质地球化学特征 |
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| 引用本文： | 祝新友,张志辉,付旭,李柏阳,王艳丽,焦守涛,孙雅琳.内蒙古赤峰维拉斯托大型锡多金属矿的地质地球化学特征[J].中国地质,2016(1):188-208. |
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| 作者姓名： | 祝新友 张志辉 付旭 李柏阳 王艳丽 焦守涛 孙雅琳 |
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| 作者单位： | 北京矿产地质研究院, 北京 100012;中国地质调查局发展研究中心, 北京 100037,中国地质调查局发展研究中心, 北京 100037,内蒙古地质勘查有限责任公司, 内蒙古呼和浩特 010010,内蒙古地质勘查有限责任公司, 内蒙古呼和浩特 010010,有色金属矿产地质调查中心, 北京 100012,中国地质大学(北京), 北京 100083,中国地质大学(北京), 北京 100083 |
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| 基金项目： | 国家科技支撑课题(2011BAB04B08);国土资源部公益性行业科研专项(201411024);中国地质调查局工作项目(12120113086300)联合资助。 |
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| 摘 要： | 2014年发现的维拉斯托锡锌矿是继20世纪末该矿区铜锌矿之后的重要找矿进展,已控制Sn金属资源量10万t。成矿作用与隐伏花岗岩体有关,该岩体侵入于前寒武纪变质岩中。矿化类型包括岩体顶部的花岗岩型锡锌矿、岩体外侧的石英脉型锡锌矿以及外围的铜锌矿。针对花岗岩、各类矿体开展了岩石学、矿床学、主微量元素地球化学、年代学等研究,初步查明岩浆演化机制、矿床成因及三类矿化的关系。细粒斑状碱长花岗岩La-ICPMS锆石UPb年龄(139.5±1.2)Ma(MSWD=3.3)。岩石中发育多级斑晶,结晶(沉淀)顺序为钠长石→石英→钾长石→钠长石→石英、黄玉、锡石、闪锌矿。花岗岩富Si O2贫Al2O3、Ti O2、TFe2O3、Ca O等,高Rb、Cs、Nb、Ta及W、Mo、Bi、Cu、Zn、In等元素,低Sr、Ba等,钠长石An0.3,与锡钨多金属矿成矿花岗岩性质相似。岩浆晚期经历了岩浆-热液过渡阶段(浆液过渡态流体),自硅酸盐相中分离出富Si、富F和富S的流体相,分别形成花岗岩型矿石中的石英、黄玉、锡石-闪锌矿囊状体(珠滴),伴随熔融包裹体和熔流包裹体,晚期逐渐、连续地向热液阶段过渡。岩浆-热液过渡阶段在岩体顶部形成花岗岩型锡锌矿石,热液阶段在岩体外侧和外围形成石英脉型锡锌矿及铜锌矿、铅锌银矿。这些矿体连同成矿花岗岩共同构成岩浆-热液型锡多金属矿床成矿系统。锡林郭勒—赤峰地区,很多脉状铅锌银矿的成矿作用与酸性侵入岩有关,深部可能存在大规模岩浆-热液型锡(钨)多金属矿。
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| 关 键 词： | 锡矿 铅锌银矿 花岗岩型 石英脉型 浆液过渡态流体 成矿机制 成矿系统 内蒙古 |
| 收稿时间： | 2015/8/31 0:00:00 |
| 修稿时间： | 2015/10/28 0:00:00 |
Geological and geochemical characteristics of theWeilasito Sn-Zn deposit, Inner Mongolia |
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| ZHU Xin-you,ZHANG Zhi-hui,FU Xu,LI Bo-yang,WANG Yan-li,JIAO Shou-tao and SUN Ya-lin.Geological and geochemical characteristics of theWeilasito Sn-Zn deposit, Inner Mongolia[J].Chinese Geology,2016(1):188-208. |
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| Authors: | ZHU Xin-you ZHANG Zhi-hui FU Xu LI Bo-yang WANG Yan-li JIAO Shou-tao and SUN Ya-lin |
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| Institution: | Beijing Institute of Geology and Mineral Resources, Beijing, 100012, China;Development and Research Center, China Geological Survey, Beijing 100037, China,Development and Research Center, China Geological Survey, Beijing 100037, China,Inner Mongolia Geological Prospecting Co., Ltd., Hohhot 010010, Inner Mongolia, China,Inner Mongolia Geological Prospecting Co., Ltd., Hohhot 010010, Inner Mongolia, China,China Non-ferrous Metals Resource Geological Survey, Beijing 100012, China,China University of Geosciences, Beijing 100083, China and China University of Geosciences, Beijing 100083, China |
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| Abstract: | The Weilasito Sn-Zn-Cu deposit is located in Keshiketen, Inner Mongolia, at latitude 44°5''5"N, longitude 117°29''53"E. The mineralization styles include granite-type Sn-Zn at the top of the granite, quartz vein type Sn-Zn ore near the granite, Cu-Zn sulfide vein and Pb-Zn-Ag sulfide vein distal from the granite. Based on petrology, geology and geochemistry of elements and chronology, the authors recognized the granite magma revolution, the origin of the deposit and the relations between the mineralization styles. LA-ICP-MS zircon U-Pb dating yielded a weighted mean 206Pb/238U age of 139.5±1.2 Ma(MSWD=3.3)for the alkali feldspar granite pluton. There are multilevel phenocrysts in the pluton, and the crystallization sequence is albite-quartz-K-feldspar-albite-quartz, topaz, cassiterite, and sphalerite. The granite rich in SiO2 and Rb, Cs, Nb, Ta, W, Mo, Bi, Cu, Zn, In etc., poor in Al2O3, TiO2, TFe2O3, CaO and Sr, Ba etc., the An value of the albite is lower than 0.3, similar to data of the granite of Sn-W deposits in the Nanling belt. Late magma experienced magmatic-hydrothermal transitional stage as well as gradual continuous evolution to hydrothermal stage. The Si rich, F rich and S rich fluid phases were separated from the magma to form the droplets (pocket) of quartz, topaz, cassiterite-sphalerite respectively in the granite-type Sn-Zn ore. The fluid inclusions are melt, melt-fluid and liquid respectively. The granite-type Sn-Zn ore formed at the top of pluton at the magma-hydrothermal transitional stage, the quartz vein-type Sn-Zn ore occurs at the outer part and the sulfide-vein Cu-Zn, Pb-Zn-Ag ore of the hydrothermal stage occurs distal from the rock body. All of the ores and the plutons comprise the magmatic hydrothermal tin polymetallic metallogenic system. In Xilin Gol-Chifeng area, there are some Pb-Zn-Ag veins (deposits and/or mineralization) related to the acidic intrusive rocks. There probably exsit large-sized hydrothermal tin (tungsten) polymetallic deposits in the depth. |
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| Keywords: | tin deposit lead-zinc-silver deposit granite type quartz vein type magma- hydrothermal transitional fluid metallogenic mechanism metallogenic system Inner Mongolia |
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